YOU SAID:
還暦になりました
INTO JAPANESE
還暦になります
BACK INTO ENGLISH
It will be 60th birthday
INTO JAPANESE
60歳の誕生日になります
BACK INTO ENGLISH
It will be my 60th birthday
INTO JAPANESE
私の60歳の誕生日になります
BACK INTO ENGLISH
It will be my 60th birthday
You should move to Japan!